package com.sky.service.impl;


import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    @Override
    public PageResult page(SetmealPageQueryDTO dto) {
        PageHelper.startPage(dto.getPage(), dto.getPageSize());
        Page<SetmealVO> page = setmealMapper.list(dto);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Override
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //1、向套餐表插入数据
        setmealMapper.insert(setmeal);
        //获取生成的套餐id
        Long setmealId = setmeal.getId();
        //2、向套餐菜品关系表插入数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //批量保存数据
        setmealDishMapper.insertBatch(setmealDishes);
    }

    @Override
    public SetmealVO getByIdWithDish(Long id) {
        SetmealVO setmealVO = setmealMapper.getByIdWithDish(id);
        return setmealVO;
    }

    @Override
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        //1、修改套餐表数据
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.update(setmeal);
        //2、修改套餐菜品关系表数据
        Long setmealId = setmealDTO.getId();
        //2.1删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
        setmealDishMapper.deleteBySetmealId(setmealId);
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //3.重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
        setmealDishMapper.insertBatch(setmealDishes);

    }

    @Override
    public void starOrStop(Integer status, Long id) {
        //1、起售时，判断当前套餐是否关联了停售的菜品
        if (status == StatusConstant.ENABLE) {
            //查询当前套餐关联的菜品数据
            List<Dish> dishList = dishMapper.getBysetmealId(id);
            if (dishList != null && !dishList.isEmpty()) {
                //遍历 dishList
                dishList.forEach(dish -> {
                    if (dish.getStatus() == StatusConstant.DISABLE) {
                        //当前套餐关联了停售的菜品，抛出业务异常
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //起售中的套餐不能删除
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE) {
                //当前套餐处于起售中，不能删除
                throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        ids.forEach(setmealId ->{
            //1、删除套餐表中的数据，操作setmeal表，执行delete
            setmealMapper.deleteById(setmealId);
            //2、删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
            setmealDishMapper.deleteBySetmealId(setmealId);
        });
    }
    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
